In SP4 the integrated assessment (IA) methodology will be developed, implemented in a full-chain IA tool and applied to transport policies and measures. The methodology and tool will integrate the emission data from SP1, the air quality and exposure models available in SP2, the exposure-response functions and burden of disease metrics from SP3 and from these calculate the health impact of policies and measures specified by SP5.

The methodology will be implemented in two options, state-of-the-art models or fast simplified models, covering the full causal chain from drivers, through emissions, concentrations and exposure (both external and internal), to effects. The first option will include external links with state of the art atmospheric models prepared in SP2; these are linked to and controlled by a central tool (Core Part) that will fully specify the changes needed to carry out scenario runs. Besides these external atmospheric models, the Core Part will contain all functionality needed for full chain analysis and will thus include the concentration-response and exposure-response functions of SP3 and processing and presentation modules. The simplified option is similar to the state-of-the-art one; the difference is that it will not use the external atmospheric models, but simple relations representing these, developed in SP2 as well. The fast simplified option will be geared at policy analysis in the exploratory stages and for generically assessing the effectiveness of types of measures. The elaborate state-of-the-art option is intended for support to advance stages of decision-making. For scenario calculations elements for both options may be combined.